Engine exhaust header pipe unit



FIG. 1 is a top plan view of an engine exhaust header pipe unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof in inverted position;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a right side elevational view thereof. 

The ornamental design of an engine exhaust header pipe unit, as shown. 